Studies on Snail, Cryptozona semirugata (Beck.) on Major Field Crops
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Date
2013
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Publisher
UAS, Dharwad
Abstract
The roving survey on the incidence level of Cryptozona semirugata (Beck.) on major
crops grown in different villages revealed that, irrespective of the locations maximum
population of snails and mean per cent plant damage was noticed during 28th Std week and
24th std. week, respectively in black soil in Hebbali Farm followed by Narendra and
Kamlapur village. Across the locations, the snail population was maximum on bund followed
by field near bund (FNB) and inside the field during the cropping period in all the villages
surveyed. In Narendra and Chikkamalligwad villages where all the crops grown in red soil
area were totally free from snail incidence.
The comparative data on the fixed plot survey showed that the snail population was
more on bund than FNB and inside the field. The per cent plant damage was more in FNB
compared to inside field. Based on the per cent plant damage greengram (11.32 and 4.27 per
cent) was highly preferred crop than other crops grown in the surveyed areas. Snail
population was positively and significantly correlated with rainfall, maximum and minimum
RH, irrespective of the crops. The per cent plant damage and per cent leaf area consumption
increased with increase in snail population from 2 to 10 per treatment at 7, 15 and 30 at days
after sowing. The per cent plant damage and per cent leaf area consumption at 7 DAS was
more compared to 15 and 30 DAS.
Metaldehyde (94.83%), common crystal salt (89.03%), copper sulphate (72.22%) and
bleaching powder (70.08%) proved highly effective in recording higher per cent mortality of
snail in field experiment. Highest grain yield of 6.39 q/ha was registered with metaldehyde
2.5%. Common crystal salt revealed highest net returns of Rs. 25,328/- with a BC ratio of
3.03 compared to all other treatments.